Packing



No. 688,730. Patented Dem-l0, I901.

.1. m. HARPER.

P A C K I N G (Application filed July 24, 1901.)

(No Model.)

mnnumu K WM llllllllllllHl ETERE co. morauma. WASHINGTON. n, c.

UNITED STATES PATENT OFFICE.

JOSEPH M. HARPER, OF CHESTER, PENNSYLVANIA.

PACKING.

SPECIFICATION forming part of Letters Patent No. 688,730, dated December 10, 1901.

' Application filed July 24, 1901. Serial No. 69,485. No model.)

To all whom it may concern.-

Be it known that LJOSEPH M. HARPER, a citizen of the United States, residing at Chester, in the county of Delaware, State ofPennsylvania, have invented a new and useful Improvement in Packing, of which the following is a specification.

My'invention consists of an improved packing-ring for packing piston and valve rods and the like, as will be hereinafter fully described and claimed.

Figure 1 represents a longitudinal section of a stuffing-box with packing-rings embodying my invention applied to a piston-rod passing therethrough. Fig. 2 represents a perspective view of a packing-ring embodying my invention. Fig. 3 represents an elevation of one of the sections of the ring.

Similar letters of reference indicate corresponding parts in the figures.

Referring to the drawings, A designates the head of a cylinder; B, the packing-casing or stuffing-box; O, the gland, and D the pistonrod. The packing-rings (designated by E) consist of two sections F, each of which is provided with a deep peripheral groove G to receive the fiber or soft packing H, said' packing extending around both sections F and having overlapping ends, as shown in Fig. 1.

On the interior of the sections F are grooves J, which reduce the thickness of the section at this point to weaken the same and permit a slight longitudinal compression thereof, so as to expand the fiber packing H in close contact with the walls of the stufing-box and to cause the said fiber packings of adjacent rings to contact at their periphery to form steam-joints, as will be referred to hereinafter.

The operation is as follows: It will be noted that in Fig. 1 the left-hand packing-ring is provided with an inclined face K to fit the inclined side of the stuffing-box and that the remaining packing-rings are fiat-sided, as shown in Fig. 3. When the rings are first applied to the rods, the bore is such that the ends of the rings are partially separated, as shown in Figs. 1 and 2. The fiber packings H rest in the bottom of the grooves G and extend beyond the periphery of the sections F and under pressure of the gland O are held in contact with the walls of the stufiing-box, so as to maintain steam-joints between the peripheries of each fiber packing H and the stufiingbox. The compression of said sections upon the inclosed fiber packings and their contact with the walls of the stuffing-box has the effect of expanding the peripheral portions thereof laterally, so that adjacent fiber packings II contact and maintain steam-joints between them. within the stufiing-box so that the sections break jointsl As the bore of the sections F wears and said sections contract upon the rod the pressure secured by the gland O forces the sides of the rings together in consequence of the weakening due to the presence of the groove J, and thereby expands the fiber packings I-I, so as to keep them always in contact with the walls of the stuffing-box and with each other.

It will be apparent that by uniting in a single packing-ring section, as F, the feature of a deep peripheral external groove, as G, the inner grooves J, and the flat ends Iain enabled to attain in practice results which cannot be reached in a packing-ring wherein either the exterior groove G or the internal groove J is omitted, and I herein make no claim to either of these features singly, but confine myself to the particular construction of packingring wherein are embodied both the features above referred to.

It will be apparent that slight changes may be made by those skilled in the art which.

will come within the scope of my invention, and I do not therefore desire to be limited in every instance to the exact construction herein shown anddescribed.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. Apacking-ring having an external peripheral groove, and fiat ends, an interior groove in the bore of said packing-ring for weakening the same longitudinally, and soft packing in said external peripheral groove.

2. In a rod-packing, a packing-case, a plurality of peripherally-grooved lon gitudinally- T00 The rings E are assembled doiiipiessihie packing-rings,l1aving flab ends 1 ing said rings iongitudinally and maintainand situated therein, said rings forming ingthe soft packingin contact with the Walls steam-joints between their ends, soft expan- 0f the casing.

sible packing in said grooves, each of said JOSEPH M. HARPER.

rings having an interior grooy'e in the bore Witnesses: thereof, whereby the thickness of said ring" at HARRY COBB KENNEDY, thispointisredu'ced, and means for compress- I G. D. MCVAY. 

